by Mark Kaelin | August 30, 2012, 12:27am PDT | Image 15 of 19
One of the most identifiable nebulae in the sky, the Horsehead Nebula in Orion, is part of a large, dark, molecular cloud. Also known as Barnard 33, the unusual shape was first discovered on a photographic plate in the late 1800s.
Credit & Copyright: Adam Block, Mt. Lemmon SkyCenter, U. Arizona
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